CN110805570A - Roof fan with adjustable air volume - Google Patents

Abstract

The invention discloses a roof fan with adjustable air volume. The roof fan comprises a ventilation duct, an air volume measuring device, a power component, a regulating air valve and an air collecting duct; It is respectively connected with the air collecting duct and the regulating air valve, and the power component is arranged in the ventilation pipe to speed up the air flow velocity; the air volume measuring device is arranged in the regulating air valve, and the air volume measuring device includes an impeller probe. The beneficial effects obtained by the invention: the impeller-type probe can measure the air volume in the roof fan in real time, and feed it back to the central controller in the form of a pulse signal, and the central controller can accurately and intelligently adjust the air volume in the roof fan to the required air volume; and The polyurethane material with good thermal insulation effect is used, which has the function of thermal insulation and avoids condensation due to temperature difference; the ventilation pipe is split, which is convenient for transportation and reduces costs; the structure is simple, easy to install and maintain in the future.

Description

A roof fan with adjustable air volume

technical field

The invention relates to the field of ventilation, in particular to a roof fan with adjustable air volume.

Background technique

A ventilation device is usually hung on the roof of the breeding farm to improve the air quality of the breeding farm; in summer, due to the hot temperature and high humidity, the ventilation device is used to cool down and dehumidify the breeding farm; in winter, due to the cold temperature, the breeding farm It needs to be sealed and insulated; but the current ventilation device only has the function of ventilation and cannot be insulated, and the ventilation air volume cannot be adjusted.

Although there are solutions for the above problems in the prior art, there are still certain defects. For example, using the new type CN207777230U, a roof fan with automatic adjustment of air output includes a base, on which a fan duct is fixed, a motor is fixed inside the fan duct, and a fan blade is fixed on the output shaft of the motor. The upper end of the wind duct is fixed with a rain cap, the rain cap is a hemispherical inner hollow cap, the outer wall of the cap is formed with four evenly distributed rectangular gaps, and each rectangular gap is provided with an arc. The outer wall of the upper end of the arc-shaped plate is fixed on the lower end of the "T" block, and the upper end of the "T" block is fixed with two parallel pull rods, the pull rods pass through the depth of the outer wall of the cap The end is sleeved on the limit seat, the limit seat is fixed on the inner wall of the cap, the baffle is fixed on the extension end of the pull rod through the limit seat, the pull rod is sleeved with a spring, the spring The two ends of the plate are pressed against the end faces of the baffle plate and the limit seat respectively; the material of the arc plate, the "T" block, the pull rod and the baffle plate is light nylon material. The air volume adjustment method of this project is that when the motor drives the fan blade to rotate, the fan blade sucks the air from the lower side of the air duct into the inner cavity of the cap. When the air volume in the cap is too large, the wind pressure also increases. The wind pressure pushes the arc-shaped plate radially outward. When the arc-shaped plate slowly leaves the rectangular gap of the cap, the area of the air outlet gradually increases, and the air volume in the cap can be discharged outdoors; when the exhaust volume needs to be increased, Increase the speed of the motor and increase the air pressure, so that the arc plate is farther away from the cap, so as to adjust the air volume. Although the roof fan can realize automatic adjustment of the air output, the roof fan cannot quantitatively adjust the air output and monitor the air output in real time; in addition, the roof fan has no thermal insulation effect; and its complex structure not only increases the The production cost is not convenient for installation and future maintenance.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a roof fan with adjustable air volume, which includes a ventilation duct, an air volume measurement device, a power assembly, a regulating air valve and an air collecting duct, and the roof fan with adjustable air volume has a structure Simple, easy to install and maintain in the future, intelligent adjustment of air volume, precise air volume adjustment, high efficiency of roof fan, rainproof, and has the advantages of thermal insulation.

In order to realize the above-mentioned purpose of the invention, the technical scheme adopted by the present invention is as follows:

A roof fan with adjustable air volume, comprising a ventilation duct, an air volume measuring device, a power component, a regulating air valve and an air collecting duct;

The ventilation duct includes several sections of the same straight air ducts, and the adjacent straight air ducts are fixedly connected by pipe clamps. One end is connected, the other end of the regulating air valve is the air inlet end of the roof fan, and the other end of the air collecting duct is the air outlet end of the roof fan;

The power assembly includes a frequency conversion motor and a wind wheel; the frequency conversion motor is arranged in the ventilation duct, the wind wheel is arranged on the output shaft of the frequency conversion motor, and the wind wheel rotates along with the output shaft;

The regulating air valve includes a casing and an air valve actuator, one end of the casing is connected to the ventilation pipe, the other end of the casing is the air inlet end, the casing is provided with a rotating shaft, and the rotating shaft is on the There is a thin-walled circular plate that rotates with the rotating shaft, and the air valve actuator is connected with the rotating shaft;

The air volume measuring device includes an impeller probe and a signal line, the impeller probe is arranged in the casing, the axis of the impeller probe coincides with the axis of the ventilation pipe, and the signal line is connected to the impeller type probe and central controller.

Preferably, the casing includes a straight cylinder section and a flared section connected to the straight cylinder section, the straight cylinder section is connected to the ventilation pipe, the end with the largest diameter of the flared section is the air inlet end, and the The inner and outer diameters of the straight cylinder section are equal to the inner and outer diameters of the ventilation pipe; the rotating shaft, the thin-walled circular plate and the impeller probe are all arranged in the straight cylinder section, and the impeller probe is opposite to the thin-walled circular probe. The plate is close to the air inlet end, that is, the impeller probe is located between the thin-walled circular plate and the air inlet end. By setting in this way, the air volume=wind speed×the cross-sectional area of the air duct, and the outer casing includes a straight section and a The flaring section has a larger cross-sectional area than the straight section. Since the air volume in the ventilation pipe and the casing is equal, the wind speed in the flaring section can be known according to the formula. Compared with the small wind speed in the straight section, and the wind speed in the straight section is equal to the wind speed in the ventilation duct, the measured air volume of the impeller probe=wind speed×the rotation area of the impeller probe, because the impeller The rotation area of the type probe is a fixed value, so it is known that the air volume measured by the impeller type probe installed in the straight cylinder section is more accurate than the air volume measured in the flared section.

Preferably, the axial distance between the center of the impeller probe and the air inlet end along the ventilation pipe is in the range of 150mm-200mm, and the center of the impeller probe and the center of the wind wheel are along the The axial distance of the ventilation pipe is in the range of 800mm-900mm. By setting in this way, since the air inlet wind direction of the air inlet end of the flared section is different, that is, the air inlet of the flared section has different wind directions. The air inlet will enter the air from all directions. If the axial distance between the center of the impeller probe and the air inlet end along the ventilation duct is too small, the accuracy of the measurement results of the impeller probe will be reduced, so The range of the axial distance between the center of the impeller probe and the air inlet end along the ventilation pipe is between 150mm-200mm, so that the impeller probe is arranged in the air inlet section where the air flow is uniform, stable and parallel, Thereby, the accuracy of the measurement results of the impeller probe can be improved; and because the airflow near the inlet and outlet of the impeller flows in a spiral manner driven by the impeller, the airflow is relatively turbulent. If the axial distance between the center and the center of the wind wheel along the ventilation pipe is too small, the accuracy of the measurement results of the impeller probe will also be reduced. The axial distance of the ventilation pipe is in the range of 800mm-900mm, which is the same as the above, and further improves the accuracy of the measurement result of the impeller probe.

Preferably, there is a gap between the outer edge of the impeller probe and the inner wall of the straight cylinder section, and the size of the gap ranges from 3 to 5 mm. By setting in this way, the measured air volume of the impeller probe=wind speed ×The rotation area of the impeller probe, the gap between the outer edge of the impeller probe and the inner wall of the straight cylinder section is in the range of 3-5mm to ensure that the impeller probe will not interfere with the inner wall of the straight cylinder section In this case, the rotating area of the impeller probe is made close to the cross-sectional area of the ventilation duct, so that the measured air volume of the impeller probe is close to the actual air volume in the ventilation duct, so that a more accurate air volume can be measured. ; If the gap is less than 3mm, although the accuracy of measuring the air volume can be further improved, the degree of improvement is not large, but the machining accuracy and installation accuracy need to be improved to avoid interference between the impeller probe and the straight cylinder section, thereby Increase production costs.

Preferably, the impeller probe includes three blades that are evenly distributed at equal angles in the circumferential direction, the blades include a leading edge and a trailing edge, and the line connecting the tip of the leading edge and the tip of the trailing edge is the blade The sharp width line, the line connecting the leaf middle of the leading edge and the leaf middle of the trailing edge is the leaf middle width line, the connecting line of the leaf root of the leading edge and the leaf root of the trailing edge is the leaf root width line, The length of the tip width line is less than the length of the width line in the middle of the leaf, and the length of the width line in the middle of the leaf is smaller than the length of the width line of the blade root. By setting in this way, the width of the blade tip to the blade root section is gradually increases, so that the contact area between the blade root and the rotating base is large, and the stability of the connection between the blade and the rotating base is improved.

Preferably, the included angle between the blade tip width line and the horizontal plane is the blade tip inclination angle, the included angle between the blade mid-width line and the horizontal plane is the mid-leaf inclination angle, and the included angle between the blade root width line and the horizontal plane is the blade tip inclination angle. root inclination angle, the blade tip inclination angle is smaller than the inclination angle of the blade, and the inclination angle of the blade is smaller than the inclination angle of the blade root, by setting in this way, according to the formula v=r·ω, v is the linear velocity, r is the radius, and ω is the angular velocity. When the impeller probe works and rotates, the angular velocity of the impeller probe is the same. As the radius increases, the linear velocity increases, that is, the linear velocity at the tip of the blade. It is the fastest and gradually decreases in the direction of the blade root, and the width of the blade section gradually increases from the blade tip to the blade root direction, and the inclination angle of the blade is from the blade tip to the blade. The direction of the blade root gradually increases, so that the airflow passes through the blade, that is, the wind resistance decreases when passing through the impeller probe, and the force on each part of the blade is more uniform, which reduces the vibration of the impeller probe and At the same time, it is beneficial to divert the air flow from the flared section into the straight section to flow parallel to the axis of the straight section, thereby reducing the eddy current near the impeller probe and further improving the The accuracy of the measurement results of the impeller probe.

Preferably, the air volume measuring device further includes a tripod, which is arranged in the straight cylinder section, the impeller probe is fixedly connected to the tripod, and the tripod is a hollow structure, and the signal One end of the line is connected to the impeller probe, and the other end of the signal line is connected to the central controller through the hollow structure of the tripod. The impeller-type probe is fixedly connected to ensure the stability of the impeller-type probe connection; on the other hand, the triangular bracket hardly affects the air intake of the casing; and the triangular bracket is a hollow structure, on the one hand, it makes The triangular support is light in weight, and hardly affects the overall quality of the roof fan; on the other hand, the signal line can pass through the hollow structure to connect the impeller probe and the central controller, so that the signal The signal line is connected in the hollow structure, and the signal line has a certain protective effect.

Preferably, both the ventilation pipe and the outer shell are made of polyurethane material. By setting in this way, the polyurethane has a good thermal insulation effect, and can play a thermal insulation role in the house in winter; and the polyurethane made of The ventilation pipe and the casing can effectively avoid the formation of condensed water on the wall of the ventilation pipe and the casing due to the large temperature difference between indoor and outdoor in winter, and the polyurethane is light in weight, which can reduce the overall quality of the roof fan.

Preferably, the air collecting tube is a thin-walled conical tube, and the end of the air collecting tube with a smaller diameter is a connecting end sleeved with the ventilation pipe, and the connecting end is provided with a plurality of downward openings along the circumferential direction. the longitudinal card slot, the open end of the longitudinal card slot is set at the edge of the connecting end, the other end of the longitudinal card slot is connected to the horizontal card slot of the longitudinal card slot, and the longitudinal card slot is connected to the horizontal card slot. The slot constitutes an inverted "L"-shaped slot; one end of the ventilation pipe connected to the air collecting duct is provided with a through hole corresponding to the "L"-shaped slot along the circumferential direction, and the through hole is provided with The bolt assembly, through this arrangement, is sleeved with the air collecting duct with a thin-walled conical cylinder. According to the experimental test, the air output can be increased by about 13.9% compared with the roof fan without the conical air collecting duct sleeved, and at the same time The power is reduced by about 12.08%; and after the longitudinal slot is aligned with the bolt assembly and embedded in the bolt assembly, the operator rotates the air collecting drum in the circumferential direction, so that the bolt assembly is clamped into the transverse direction. In the card slot, the bolt assembly is then locked to fix the air collecting duct, and only one operator can install the air collecting duct, which is convenient for installation.

Preferably, the end with the larger diameter of the air collecting duct is the air outlet end, the air outlet end of the air collecting duct is provided with a top cap, and between the top cap and the air collecting duct there are several circumferentially arranged The pillars are evenly distributed at equal angles, so that a gap is formed between the air collecting duct and the top cap as an air outlet, and by setting in this way, on the one hand, rainwater can be prevented from passing through the The ventilation pipe and the casing enter the house, which also prevents the components of the roof fan from entering the water and causing failure; A gap is formed between the air duct and the top cap as an air outlet to ensure the normal flow of the airflow in the roof fan.

Compared with the prior art, the present invention has achieved beneficial technical effects:

1. Using the roof fan with adjustable air volume, the impeller probe can measure the air volume in the roof fan in real time, and the impeller probe feeds back the actual air volume to the central controller in the form of a pulse signal. The signal is transmitted to the central controller through the signal line. After analyzing the pulse signal, the central controller changes the frequency of the variable frequency motor or drives the damper actuator to work, thereby changing the frequency of the variable frequency motor. The rotational speed or the ventilation area of the air valve is adjusted, and finally the air volume in the roof fan is adjusted to the required air volume, so as to realize intelligent adjustment of the air volume.

2. The impeller probe is arranged in the straight cylinder section of the regulating air valve, and the gap between the outer edge of the impeller probe and the inner wall of the straight cylinder section is in the range of 3-5mm, so that the The rotation area of the impeller probe is similar to the cross-sectional area of the ventilation duct, so that the measured air volume of the impeller probe is close to the actual air volume in the ventilation duct, so that a more accurate air volume can be measured and the air volume adjustment can be ensured. precision.

3. The axial distance between the center of the impeller probe and the air inlet end along the ventilation pipe is in the range of 150mm-200mm, and the center of the impeller probe and the center of the wind wheel are along the The axial distance of the ventilation pipe is in the range of 800mm-900mm, so that the impeller probe is arranged in the air inlet buckle section where the air flow is uniform, stable and parallel, and the accuracy of the measurement result of the impeller probe is improved.

4. Since the roof fan with adjustable air volume is equipped with the air collecting duct, the experimental test shows that the air output can be increased by about 13.9% compared with the roof fan without the conical air collecting duct. The power is reduced by about 12.08%, which greatly improves the efficiency of the roof fan.

5. Because the roof fan is provided with a top cap, it can prevent rainwater from entering the house through the roof fan, which plays a role in preventing rain, and also prevents the components in the roof fan from entering water and causing failure. There are struts between, so that the top cap and the air collecting duct form a gap as an air outlet to ensure the normal flow of the air flow of the roof fan.

6. Since the ventilation pipe and the shell are made of polyurethane material, polyurethane has good heat insulation effect, and has the effect of heat insulation in winter; and avoid the ventilation pipe and the wall of the shell. Condensed water is formed on it.

7. The roof fan has a simple structure and is easy to install and maintain in the future.

Description of drawings

1 is a schematic diagram of an embodiment of the present invention;

Fig. 2 is the schematic diagram of the semicircle straight air duct and its partial enlargement of the embodiment of the present invention;

FIG. 3 is a schematic view of the top view of FIG. 2 and a partial enlarged view thereof according to an embodiment of the present invention;

4 is a schematic diagram of a pipe clamp and a cross-section thereof according to an embodiment of the present invention;

5 is a schematic diagram of a partial structure of an embodiment of the present invention;

6 is a schematic diagram of a regulating air valve according to an embodiment of the present invention;

FIG. 7 is a schematic top view of FIG. 6 according to an embodiment of the present invention;

FIG. 8 is a partially enlarged schematic diagram of FIG. 7 according to an embodiment of the present invention;

9 is a schematic diagram of a ring cover according to an embodiment of the present invention;

10 is a schematic diagram of a bolt assembly according to an embodiment of the present invention;

11 is an axial schematic diagram of the connection between the impeller probe and the tripod according to the embodiment of the present invention;

FIG. 12 is a schematic front view of FIG. 11 according to an embodiment of the present invention.

Among them, the technical features referred to by each reference number are as follows:

1. Shell; 1.1. Flaring section; 1.2. Straight section; 2. Impeller probe; 3. Triangular bracket; 4. Air valve actuator; 5. Ventilation pipe; 6. Frequency conversion motor; 7. Support frame; 8. Wind wheel; 9. Pipe clamp; 9.1, Notch; 10, Straight air duct; 11, Air collecting duct; 11.1, "L" shaped slot; 11.2, Recessed cavity; 12, Top cap; 13, Semi-circular straight air duct; 13.1, Trapezoid groove; 13.2, Outer wall groove; 13.3, Trapezoid socket; 13.4, Semicircle groove; 13.5, Semicircle socket; 14, Screw; 15, Ring cover; 16, Fixing nut; 17, Bolt; 18, Fixed sheet; 19, thin-walled circular plate; 20, shaft; 21, stainless steel sheet; 22, split elastic pin; 23, air outlet; 24, strut; 25, blade; 25.1, blade tip; 25.2, blade root; 25.3, leading edge ; 25.4, trailing edge; 26, swivel base.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments, but the claimed scope of the present invention is not limited to the following specific embodiments.

1-12, the present embodiment discloses a roof fan with adjustable air volume, which is characterized in that it includes a ventilation pipe 5, an air volume measurement device, a power assembly, a regulating air valve and an air collecting duct 11;

Referring to Figure 1, the ventilation duct 5 includes several sections of the same straight air duct 10, which can adjust the height of the roof fan according to the different heights of the house, so that a certain distance is maintained between the roof fan and the ground. In this embodiment, the ventilation duct 5 includes four parts. Straight air ducts 10 with the same segment, the adjacent straight air ducts 10 are butted end to end, and the adjacent straight air ducts 10 are fixedly connected by pipe clamps 9, and the two ends of the ventilation pipe 5 are respectively connected with the regulating air valve. It is connected with one end of the air collecting duct 11, the other end of the regulating air valve is the air inlet end of the roof fan, and the other end of the air collecting duct 11 is the air outlet end of the roof fan;

Referring to FIG. 1, the power assembly includes a support frame 7, a frequency conversion motor 6 and a wind wheel 8; the support frame 7 is arranged in one of the straight air ducts 10 of the ventilation pipe 5, the support frame 7 is provided with threaded holes, and the straight air duct 10 is provided with Through holes corresponding to the threaded holes of the support frame 7, the support frame 7 and the straight air duct 10 are fixedly connected by screws 14, the frequency conversion motor 6 is arranged below the support frame 7, and the frequency conversion motor 6 and the support frame 7 use screws 14 is fixedly connected, and the axis of the output shaft of the variable frequency motor 6 coincides with the axis of the ventilation duct 5, the hub of the wind wheel 8 is sleeved on the output shaft of the variable frequency motor 6, and the wind wheel 8 can follow the output shaft of the variable frequency motor 6 to rotate , the frequency conversion motor 6 can be adjusted in the frequency range of 5Hz-50Hz, so that the speed of the wind wheel 8 can be changed from 200r/min to 900r/min, and the air volume can be adjusted from 2000m ³ /h to 14100m ³ /h;

6-8, the regulating air valve includes a casing 1 and a damper actuator 4, one end of the casing 1 is connected to the ventilation pipe 5, the other end of the casing 1 is the air inlet end, and the casing 1 is provided with a rotating shaft 20, specifically , at both ends of the upper part of the casing 1 along the radial direction, there are through holes slightly larger than the diameter of the rotating shaft 20, which are used to cooperate with the rotating shaft 20, reduce the friction between the casing 1 and the rotating shaft 20 as much as possible, and reduce the beating of the rotating shaft 20; the rotating shaft The axis of the 20 is perpendicular to the axis of the casing 1, and the rotating shaft 20 protrudes from the casing 1 along the radial direction of the casing 1. The rotating shaft 20 is provided with a thin-walled circular plate 19 that rotates with the rotating shaft 20. The ends are symmetrically provided with a rectangular cutout of the same width as the diameter of the rotating shaft 20, and the length of the rectangular cutout is half of the length of the rotating shaft 20, and the upper and lower ends of the thin-walled circular plate 19 at the position of the rectangular cutout are provided with "T"-shaped stainless steel sheets 21 , the stainless steel sheet 21 includes a transverse section and a longitudinal section, and a groove is provided on the transverse section for fixing the rotating shaft 20; At the rectangular incision, and sandwiched between the stainless steel sheets 21, use the open elastic pin 22 to pass through the groove of the stainless steel sheet 21 and cooperate with the through hole of the rotating shaft 20 to fix the rotating shaft 20, and pass the other end of the rotating shaft 20 through the upper part of the casing 1 The through hole of the thin-walled circular plate 19 is fixed in the casing 1 and can be rotated around the axis of the rotating shaft 20; and the diameter of the thin-walled circular plate 19 is smaller than the inner diameter of the casing 1, and the diameter of the thin-walled circular plate 19 is usually 0.95~ Between 0.98 times, not only the friction between the thin-walled circular plate 19 and the inner wall of the casing 1 is avoided, the thin-walled circular plate 19 can be guaranteed to rotate smoothly, and when the thin-walled circular plate 19 is in a position perpendicular to the axis of the casing 1, the thin-walled circular plate 19 can block ventilation to the greatest extent; The rotating shaft 20 at one end is fixedly matched with the damper actuator 4, and the damper actuator 4 has a built-in position detector. The damper actuator 4 with the position detector can detect and adjust the opening angle of the thin-walled circular plate 19 in real time. The opening angle of the plate 19 can be adjusted from 0° to 90°;

Referring to Figure 1, the air volume measurement device includes an impeller probe 2 and a signal line. The impeller probe 2 is arranged in the housing 1, and the axis of the impeller probe 2 coincides with the axis of the ventilation duct 5, and the signal line connects the impeller probe 2 and the center. controller.

After using the roof fan with adjustable air volume, the impeller probe 2 can measure the air volume in the roof fan in real time, and the impeller probe 2 feeds back the actual air volume to the central controller in the form of a pulse signal, and the pulse signal is transmitted to the central controller through the signal line. The controller, the central controller analyzes the pulse signal, changes the frequency of the variable frequency motor 6 or drives the air valve actuator 4 to work, thereby changing the speed of the variable frequency motor 6 or adjusting the ventilation area of the air valve, and finally adjusts the air volume in the roof fan to the desired value. Air volume is required to realize intelligent adjustment of air volume.

Referring to FIGS. 2-4, it is further described in detail that each section of straight air duct 10 is composed of two semi-circular straight air ducts 13 with the same structure, that is, only one set of molds is needed to process the semi-circular straight air duct 13, which reduces the production cost. And the volume of the transport package is small, which reduces the transportation cost; the two ends of the two-lobed semi-circular straight air duct 13 are respectively provided with a raised semi-circular stop 13.5 and a semi-circular groove 13.4 matching the semi-circular stop 13.5. The semi-circular stop 13.5 of the cylinder 13 is inserted into the semi-circular groove 13.4 of the other half-circular straight air cylinder 13. Through the positioning function of the semi-circular stop 13.5, the combined assembly of the two semi-circular straight air cylinders 13 is facilitated, and the two semi-circular straight air cylinders 13 are guaranteed to be straight. The airtightness after the combination of the air duct 13; after the two semicircular straight air ducts 13 are combined into a straight air duct 10, there is a trapezoidal stop 13.3 at the top of the straight air duct 10, and the bottom end is matched with the trapezoidal stop 13.3 The trapezoidal groove 13.1, and the outer wall groove 13.2 on the upper and lower parts of the straight air duct 10, the trapezoidal stop 13.313 at the top of one straight air duct 10 is clamped into the trapezoidal groove at the bottom end of the other straight air duct 10. At 13.1, the positioning of the trapezoidal stop 13.3 facilitates the connection and assembly of the two sections of straight air ducts 10, and ensures the tightness after the two sections of straight air ducts 10 are connected; the pipe clamp 9 is a ring with a notch 9.1, and along the There are several through holes in the circumferential direction, and everted fastening edges are provided at both ends of the gap 9.1, and the everted fastening edges are provided with through holes; both ends of the pipe clamp 9 along the axial direction are provided with everted positioning edges, so that The section of the pipe presents a "[" shape. Insert the everted positioning edge into the outer wall groove 13.2 of the connecting part of the two-stage straight air duct 10, use the bolt 17 to pass through the through hole of the fastening edge of the pipe clamp 9, use the fixing nut 16 to lock the gap 9.1, and finally use the screw. 14. The through hole at the ring of the pipe clamp 9 is fixedly connected with the straight air cylinder 10, so that the pipe clamp 9 tightly wraps the connecting part of the two straight air cylinders 10 and connects the two straight air cylinders 10 into one. , and ensure the good sealing performance of the straight air duct 10; after the four-section straight air duct 10 is connected into the ventilation pipe 5, the top end of the ventilation pipe 5 is provided with a ring cover 15 that is adapted to the trapezoidal stop 13.3, and the air valve is adjusted. The outer shell 1 is integrally formed, and the top end of the outer shell 1 is provided with a trapezoidal stop 13.3 that matches the trapezoidal groove 13.1 at the bottom end of the ventilation pipe 5, and the top end of the outer shell 1 is connected with the bottom end of the ventilation pipe 5. The connection ensures the cylindrical structure of the ventilation pipe 5.

Referring to Figure 6, the housing 1 includes a straight section 1.2 and a flared section 1.1 connected to the straight section 1.2, the flared section 1.1 is located at the air inlet end, the straight section 1.2 is connected to the ventilation pipe 5, and the inner and outer diameters of the straight section 1.2 are connected to the ventilation The inner and outer diameters of the pipe 5 are equal, the rotating shaft 20, the thin-walled circular plate 19 and the impeller-type probe 2 are all arranged in the straight cylinder section 1.2, and the impeller-type probe 2 is close to the air inlet end relative to the thin-walled circular plate 19, that is, the impeller-type probe 2 is located in the flared section 1.1 It is convenient for the installation of the impeller probe 2 between the air inlet end and the impeller probe 2, and the impeller probe 2 is arranged in the air inlet section. The accuracy of the measurement results, if the impeller probe 2 is set in the air outlet section, the air flow in the air outlet section is relatively turbulent, which reduces the accuracy of the measurement results of the impeller probe 2; air volume = wind speed × cross-sectional area of the air duct, flared section The cross-sectional area of 1.1 is larger than that of the straight section 1.2. Since the air volume in the ventilation pipe 5 and the casing 1 is equal, it can be seen from the formula that the wind speed in the flared section 1.1 is smaller than that in the straight section 1.2, and Since the inner diameter of the straight section 1.2 is equal to the inner diameter of the ventilation pipe 5, the wind speed of the straight section 1.2 is equal to the wind speed in the ventilation pipe 5. The measured air volume of the impeller probe 2 = wind speed × the rotation area of the impeller probe 2. The rotation area of 2 is a fixed value, so it is known that the air volume measured by the impeller probe 2 set in the straight cylinder section 1.2 is more accurate than the air volume measured in the flared section 1.1.

Referring to Figure 1, the axial distance B between the center of the impeller probe 2 and the air inlet end along the ventilation pipe 5 is in the range of 150mm-200mm, and the center of the impeller probe 2 and the center of the wind wheel 8 are along the ventilation pipe 5. The range of the axial distance C is between 800mm and 900mm. Since the air inlet direction of the air inlet end of the flared section 1.1 is different, that is, the air inlet end of the flared section 1.1 will enter the air from all directions. If the axial distance B between the center and the air inlet end along the ventilation pipe 5 is too small, the accuracy of the measurement results of the impeller probe 2 will be reduced. The axial distance B is 180mm, so that the impeller probe 2 is arranged in the air inlet section where the air flow is uniform, stable and parallel, so that the accuracy of the measurement results of the impeller probe 2 can be improved; Driven by the wind wheel, the air flows spirally, and the air flow is relatively turbulent. If the axial distance C between the center of the impeller probe 2 and the center of the wind wheel 8 along the ventilation duct is too small, the measurement accuracy of the impeller probe 2 will also be reduced. , the axial distance C between the center of the impeller probe 2 and the center of the wind wheel 8 along the ventilation pipe is 850 mm, which is the same as the above principle, and further improves the accuracy of the measurement results of the impeller probe 2.

Referring to Figure 1, there is a gap A between the outer edge of the impeller probe 2 and the inner wall of the straight section 1.2, the size of the gap A is between 3-5mm, and the measured air volume of the impeller probe 2 = wind speed × The impeller probe 2 Rotation area, in this embodiment, the gap A between the outer edge of the impeller probe 2 and the inner wall of the straight section 1.2 is 4 mm, so as to ensure that the impeller probe 2 will not interfere with the inner wall of the straight section 1.2, so that the impeller The rotating area of the impeller probe 2 is similar to the cross-sectional area of the ventilation duct 5, so the measured air volume of the impeller probe 2 is close to the actual air volume in the ventilation duct 5, so that a more accurate air volume can be measured; if the outer edge of the impeller probe 2 The gap A between the inner wall of the straight section 1.2 is less than 3mm. Although the accuracy of measuring the air volume can be further improved, the degree of improvement is not large. Instead, it is necessary to improve the machining accuracy and installation accuracy to avoid the gap between the impeller probe 2 and the straight section 1.2. Interference occurs, thereby increasing production costs.

11 , the impeller probe 2 includes three blades 25 and a rotating base 26. The three blades 25 are evenly arranged outside the rotating base 26 at equal angles in the circumferential direction. The blades 25 include a leading edge 25.3 and a trailing edge 25.4. The line connecting the tip 25.1 of the edge 25.3 and the tip 25.1 of the trailing edge 25.4 is the tip width line, the line connecting the leaf middle of the leading edge 25.3 and the middle leaf of the trailing edge 25.4 is the middle width line, and the root 25.2 of the leading edge 25.3 The line connecting the blade root 25.2 of the trailing edge 25.4 is the blade root width line, the length D of the blade tip width line is less than the length E of the leaf middle width line, and the length E of the leaf middle width line is less than the length F of the root width line, that is, The width of the section from the blade tip 25.1 to the blade root 25.2 increases gradually, so that the contact area between the blade root 25.2 and the rotating base 26 is large, and the stability of the connection between the blade 25 and the rotating base 26 is improved.

Referring to FIG. 12 , the angle between the blade tip width line and the horizontal plane is the tip inclination angle θ ₂ , the angle between the blade width line and the horizontal plane is the blade inclination angle θ ₃ , and the angle between the blade root width line and the horizontal plane is the blade root. The inclination angle θ ₄ , the blade tip inclination angle θ ₂ is smaller than the blade inclination angle θ ₃ , and the blade inclination angle θ ₃ is smaller than the blade root inclination angle θ ₄ , according to the formula v=r·ω, v is the linear velocity, and r is the radius , ω is the angular velocity. When the impeller probe 2 works and rotates, the angular velocity of the impeller probe 2 is the same. With the increase of the radius, the linear velocity increases, that is, the linear velocity at the tip 25.1 is the fastest and goes to the blade root. The direction of 25.2 gradually decreases, and the width of the cross-section of the blade 25 gradually increases from the direction of the blade tip 25.1 to the blade root 25.2, and the inclination angle of the blade 25 gradually increases from the direction of the blade tip 25.1 to the blade root 25.2, so that the airflow passes through the blade. 25, that is, the wind resistance is reduced when passing through the impeller probe 2, and the force on each part of the blade 25 is more uniform, reducing the vibration and deformation of the impeller probe 2, and at the same time, it is beneficial to enter the straight cylinder section 1.2 from the flared section 1.1 The air flow is directed to flow parallel to the axis of the straight cylinder section 1.2, thereby reducing the eddy current near the impeller probe 2 and further improving the accuracy of the measurement results of the impeller probe 2.

1, the air volume measuring device also includes a tripod 3, the tripod 3 is arranged in the straight cylinder section 1.2, the impeller probe 2 is fixedly connected with the tripod 3, specifically, the rotating base 26 is embedded in the concave hole of the tripod 3 , and the rotating base 26 and the concave hole of the triangular support 3 are provided with rolling bearings, the outer ring of the rolling bearing and the concave hole of the triangular support 3 are in interference fit, and the inner ring of the rolling bearing and the rotating base 26 are in interference fit. The triangular bracket 3 is fixedly connected with the impeller probe 2 to ensure the stability of the connection of the impeller probe 2; on the other hand, the triangular bracket 3 hardly affects the air intake of the housing 1, that is, does not affect the air intake of the roof fan; and the triangular bracket 3 is a hollow structure, one end of the signal line is connected to the impeller probe 2, and the other end of the signal line is connected to the central controller through the hollow structure of the tripod 3. On the one hand, the tripod 3 is a hollow structure, so that the tripod 3 The light weight hardly affects the overall quality of the roof fan; on the other hand, the signal line can be connected to the impeller probe 2 and the central controller through the hollow structure, which is convenient for the connection of the signal line. The signal line plays a certain protective role.

The ventilation pipe 5 and the outer shell 1 are made of polyurethane material, and are made of polyurethane through a foaming process. Polyurethane has a good thermal insulation effect and can keep the house warm in winter; and the ventilation pipe made of polyurethane 5 and the casing 1 can effectively avoid the formation of condensed water on the walls of the ventilation pipe 5 and the casing 1 due to the large temperature difference between indoor and outdoor in winter, and the polyurethane is light in weight, which can reduce the overall quality of the roof fan.

Referring to Fig. 5, the air collecting duct 11 is a thin-walled conical tube, and the taper θ ₁ of the air collecting duct is 7°, so that the air collecting duct 11 is connected to the blower and reaches a higher energy efficiency while the air volume is larger; and the diameter of the air collecting duct 11 is relatively high. The small end is the connecting end that is sleeved with the ventilation pipe 5. The connecting end is provided with six longitudinal grooves that are evenly distributed at equal angles and have downward openings along the circumferential direction. The other end of the connector is connected to the horizontal slot of the longitudinal slot, the longitudinal slot and the horizontal slot form an inverted "L"-shaped slot 11.1, and the connecting end is provided with six equiangularly distributed concave cavities 11.2 along the circumferential direction, and the concave cavities 11.2 Including the fixed surface, between the fixed surface and the inner wall of the connecting end is a connecting thin wall, and the "L"-shaped card slot 11.1 is arranged on the connecting thin wall, so that the structure after the air collecting duct 11 is connected with the ventilation pipe 5 is more secure; the ventilation pipe 5. One end connected to the air collecting duct 11 is provided with a through hole corresponding to the "L"-shaped slot 11.1 in the circumferential direction. The through hole of the ventilation pipe 5 is provided with a bolt 17 component, and the bolt 17 component includes an "L" The fixing piece 18 and the bolts 17, the fixing piece 18 includes a longitudinal section and a transverse section, the longer section is the longitudinal section, and the shorter section is the transverse section, and the longitudinal section and the transverse section are provided with through holes, and the bolts 17 are passed through. Pass through the through hole of the longitudinal section to the limit position, and weld the bolt 17 and the fixing plate 18 into one body; the bolt 17 passes through the ventilation pipe 5 and the "L"-shaped slot 11.1 in turn from the ventilation pipe 5, and passes through the screw 14. The lateral section of the fixing piece 18 is then threadedly connected with the ventilation pipe 5, thereby fixing the fixing piece 18 on the top of the ventilation pipe 5, indirectly fixing the ring cover 15 to ensure the cylindrical structure of the ventilation pipe 5, and indirectly fixing the bolt 17, which is fixed after installation. When the nut 16 is used, the bolt 17 will not rotate, which is convenient for installation. Insert the gasket into the bolt 17 extending out of the longitudinal slot, and then use the fixing nut 16 to fix it. Since the roof fan is equipped with the thin-walled conical cylinder 11, the experimental test shows that compared with no sleeve The roof fan connected to the conical air duct 11 can increase the air output by about 13.9%, while the power is reduced by about 12.08%; and after the operator inserts the longitudinal groove of the air duct 11 into the bolt 17, rotates the air duct 11 The bolts 17 are snapped into the transverse grooves, and then the air collecting duct 11 can be fixedly connected to the ventilation pipe 5 through the fixing nut 16. Only one operator can install the air collecting duct 11, which is convenient for installation.

Referring to FIG. 5 , the inner wall of the connecting end is parallel to the outer wall of the ventilation pipe 5 , so that the structure after the air collecting duct 11 and the ventilation pipe 5 are connected is more secure and stable.

Referring to FIG. 1 , the larger diameter end of the air collecting duct 11 is the air outlet end, and the wind collecting end of the air collecting duct 11 is provided with a top cap 12 , and four circumferentially and so on are arranged between the top cap 12 and the air collecting duct 11 . The pillars 24 with evenly distributed angles, the two ends of the pillars 24 are fixedly connected with the air collecting duct 11 and the top cap 12 by screws, so that the air collecting duct 11 and the top hat 12 form a gap as the air outlet 23, on the one hand, it can prevent rainwater from passing through The wind collecting duct 11, the ventilation pipe 5 and the casing 1 of the roof fan enter the house, which also prevents the components in the roof fan from entering the water and causing failure; The gap is used as the air outlet 23 to ensure the normal flow of the airflow in the roof fan.

The air volume adjustment method of the roof fan of the present invention is shown in the following steps:

1) Calibrate the impeller probe 2, place the impeller probe 2 in the wind tunnel, and the axis of the impeller probe 2 is parallel to the axis of the wind tunnel, start the wind tunnel to generate the set air volume, and drive the impeller probe 2 to rotate to generate pulses Signal, measure the pulse signal generated by the current impeller probe 2, and obtain the linear relationship between the air volume and the pulse signal of the vane probe by measuring the data of multiple groups of air volume and pulse signal;

2) Set the impeller probe 2 in the roof fan according to the above structure, convert the rated pulse signal according to the required air volume, input the rated pulse signal into the control system of the central controller, start the frequency conversion motor 6, and the frequency conversion motor 6 drives the wind wheel. 8 rotate to speed up the flow rate of the airflow in the roof fan, thereby generating a certain air volume, driving the impeller probe 2 to rotate to generate the actual pulse signal, and the actual pulse signal is input to the central controller through the signal line;

3) The central controller compares and analyzes the actual pulse signal and the rated pulse signal:

If the actual pulse signal is equal to the rated pulse signal, the central controller does not adjust the variable frequency motor 6 or the damper actuator 4;

If the actual pulse signal is less than the rated pulse signal, it means that the current actual air volume is too small, then the central controller increases the frequency of the variable frequency motor 6, thereby increasing the speed of the variable frequency motor 6, and drives the wind wheel 8 to generate a larger air volume until the actual pulse signal is equal to the rated value. Pulse signal; if the frequency of the variable frequency motor 6 is adjusted to the maximum value, when the actual pulse signal is still less than the rated pulse signal, the central controller drives the air valve actuator 4 to work, the air valve actuator 4 drives the rotating shaft 20 to rotate, and the rotating shaft 20 drives the thin-walled circle The plate 19 rotates to increase the ventilation area of the regulating air valve. When the axis of the thin-walled circular plate 19 is perpendicular to the axis of the ventilation pipe 5, the ventilation area of the regulating air valve reaches the maximum until the actual pulse signal is equal to the rated pulse signal;

If the actual pulse signal is greater than the rated pulse signal, it means that the current actual air volume is too large, then the central controller will reduce the frequency of the variable frequency motor 6, thereby reducing the speed of the variable frequency motor 6 and the air volume generated by the wind rotor 8, until the actual pulse signal is equal to the rated pulse signal If the frequency of the variable frequency motor 6 is adjusted to the minimum value and the actual pulse signal is still greater than the rated pulse signal, the central controller drives the air valve actuator 4 to work, the air valve actuator 4 drives the rotating shaft 20 to rotate, and the rotating shaft 20 drives the thin-walled circular plate 19 rotates to reduce the ventilation area of the regulating air valve. When the axis of the thin-walled circular plate 19 coincides with the axis of the ventilation pipe 5, the ventilation area of the regulating air valve reaches the minimum until the actual pulse signal is equal to the rated pulse signal.

When the frequency conversion motor 6 does not need a roof fan, generally, in winter, the damper is executed to drive the thin-walled circular plate 19 to be adjusted to be perpendicular to the axis of the ventilation pipe 5, that is, the roof fan is in a completely closed state, because the ventilation pipe 5 And the shell 1 is made of polyurethane with good heat insulation effect through foaming process, which can play the role of heat preservation and moisturizing; Generally, in summer, the damper actuator 4 drives the thin-walled circular plate 19 to adjust to the axis of the thin-walled circular plate 19 It is perpendicular to the axis of the ventilation pipe 5, that is, the roof fan is in a fully open state, and the principle of hot air rising is used to achieve natural ventilation in the house.

Based on the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the invention.

Claims (10)

1. The roof fan with the adjustable air volume is characterized by comprising a ventilation pipe, an air volume measuring device, a power assembly, an adjusting air valve and an air collecting cylinder;

the ventilation pipe comprises a plurality of straight air cylinders with the same section, the adjacent straight air cylinders are fixedly connected through pipe clamps, two ends of the ventilation pipe are respectively connected with the adjusting air valve and one end of the wind gathering cylinder, the other end of the adjusting air valve is the air inlet end of the roof fan, and the other end of the wind gathering cylinder is the air outlet end of the roof fan;

the power assembly comprises a variable frequency motor and a wind wheel; the variable frequency motor is arranged in the ventilation pipe, the wind wheel is arranged on an output shaft of the variable frequency motor, and the wind wheel rotates along with the output shaft;

the adjusting air valve comprises a shell and an air valve actuator, one end of the shell is connected with the ventilation pipe, the other end of the shell is the air inlet end, a rotating shaft is arranged on the shell, a thin-wall circular plate which rotates along with the rotating shaft is arranged on the rotating shaft, and the air valve actuator is connected with the rotating shaft;

the air quantity measuring device comprises an impeller type probe and a signal wire, the impeller type probe is arranged in the shell, the axis of the impeller type probe is overlapped with the axis of the ventilation pipe, and the signal wire is connected with the impeller type probe and the central controller.

2. The roof fan with the adjustable air volume according to claim 1, wherein the outer shell comprises a straight cylinder section and a flared section connected with the straight cylinder section, the straight cylinder section is connected with the ventilation pipe, the end with the largest diameter of the flared section is the air inlet end, and the inner diameter and the outer diameter of the straight cylinder section are equal to the inner diameter and the outer diameter of the ventilation pipe; the rotating shaft, the thin-wall circular plate and the impeller type probe are all arranged in the straight cylinder section, and the impeller type probe is close to the air inlet end relative to the thin-wall circular plate, namely the impeller type probe is positioned between the thin-wall circular plate and the air inlet end.

3. The roof fan with the adjustable air volume according to claim 2, wherein the axial distance between the center of the impeller-type probe and the air inlet end along the ventilation pipe ranges from 150mm to 200mm, and the axial distance between the center of the impeller-type probe and the center of the wind wheel along the ventilation pipe ranges from 800mm to 900 mm.

4. The roof fan with the adjustable air volume as claimed in claim 2, wherein a gap exists between the outer edge of the impeller type probe and the inner wall of the straight cylinder section, and the size of the gap is in a range of 3-5 mm.

5. The roof fan with the adjustable air volume according to claim 2, wherein the impeller-type probe comprises three blades uniformly distributed at equal angles along the circumferential direction, each blade comprises a front edge and a rear edge, a blade tip connecting line between the front edge and the rear edge is a blade tip width line, a blade root connecting line between the front edge and the rear edge is a blade root width line, the length of the blade tip width line is smaller than that of the blade root width line, and the length of the blade root width line is smaller than that of the blade root width line.

6. The wind-adjustable roof fan of claim 5, wherein the included angle between the blade tip width line and the horizontal plane is a blade tip inclination angle, the included angle between the blade leaf width line and the horizontal plane is a blade leaf inclination angle, the included angle between the blade root width line and the horizontal plane is a blade root inclination angle, the blade tip inclination angle is smaller than the blade leaf inclination angle, and the blade leaf inclination angle is smaller than the blade root inclination angle.

7. The roof fan with the adjustable air volume according to claim 2, characterized in that the air volume measuring device further comprises a triangular support, the triangular support is arranged in the straight cylinder section, the impeller type probe is fixedly connected with the triangular support, the triangular support is of a hollow structure, one end of the signal wire is connected with the impeller type probe, and the other end of the signal wire penetrates out of the hollow structure of the triangular support to be connected with the central controller.

8. The roof fan with the adjustable air volume according to claim 1, wherein the ventilation pipe and the housing are both made of polyurethane material.

9. The roof fan with the adjustable air volume according to claim 1, wherein the wind gathering cylinder is a thin-walled conical cylinder, the end with the smaller diameter of the wind gathering cylinder is a connecting end sleeved with the ventilation pipe, the connecting end is circumferentially provided with a plurality of longitudinal clamping grooves with downward openings, the opening ends of the longitudinal clamping grooves are arranged at the edges of the connecting end, the other ends of the longitudinal clamping grooves are communicated with the transverse clamping grooves of the longitudinal clamping grooves, and the longitudinal clamping grooves and the transverse clamping grooves form inverted L-shaped clamping grooves; and through holes which are in one-to-one correspondence with the L-shaped clamping grooves are formed in the circumferential direction at one end of the ventilation pipe connected with the air gathering cylinder, and inner bolt assemblies are arranged in the through holes.

10. The roof fan with the adjustable air volume according to claim 9, wherein the end of the wind gathering cylinder with the larger diameter is the air outlet end, the air outlet end of the wind gathering cylinder is provided with a top cap, and a plurality of struts which are uniformly distributed at equal angles along the circumferential direction are arranged between the top cap and the wind gathering cylinder, so that a gap is formed between the wind gathering cylinder and the top cap and serves as an air outlet.

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